Hey,
I am a gameplay programmer for Ubisoft, with the experience you need for this project.
Here is my quote:
1) Server hosting on HostGator + 2) Login / Register = about 8 hours (including with OAuth, the login system Facebook and Google use, among others)
3) After players login they can click to walk around = about 8 hours (basic character controller + animation + network synchronization)
4) Slightly transparent chat system = about 4 hours (basic, 1 channel, "World" chat system with networking where everyone sees what everyone types)
5) Must be completed with Unity 5 - no problem
Time estimate: about 20 hours
My rate: 16 Euros per hour
Freelancer cut: 35 Euros
Total: 355 Euros
My relevant experience:
I have experience with PHP and MySQL from my early web freelancing years, have done login systems before.
I have experience with Unity gameplay and network programming, gained while working at Ubisoft
Would you like to have a chat and discuss details? I can get started with work right away.
All the best,
Eddie